I have Accurate, Hornady, Hodgdon, Speer, Lyman, Seirra and a couple others that I can't think of off hand. They all have their good points. Some will give you the most accurate load they had during testing. Hodgdon's gives other powder manufacters loading data along with theirs. Hornaday's new manual gives data for the M1 Garand. So for me it's hard to pick just one.